bonnie, a republican. caller: i would like to know -- i read a story in "reader's digest" about a doctor who had studied a young man that had autism. he said he was a friend to the mother of the boy. he had found out that the boy had severe allergies. are there any studies that have gone along with that? guest: thank you for the question. i suspect you read that article about 10 years ago or maybe 15. there was a doctor in the uk who proposed the notion that he was recovering measles virus from people and was proposing a link. his papers have all been retracted by the charles the publish them. he had his license to practice withdrawn in the united kingdom. so i think that the scientific validity of that work has been called very seriously into question. there have been a lot of people -- people are looking very, very hard to find out what is causing autism. this is a terrible thing. would love to know the cause so that we can prevent it. but that study has been completely discredited. host: wilmington, nor